books.google.com - Signals intelligence (SIGINT), or the collection of intelligence by the interception of communications or monitoring of other electronic signals, is the most productive source of intelligence available to governments and their defence establishments.In the Asia-Pacific region, there are moves to greater...https://books.google.com/books/about/Signals_Intelligence_in_the_Post_cold_Wa.html?id=TvpdLDMcaJ4C&q=geostationary+SIGINT+satellites&utm_source=gb-gplus-shareSignals Intelligence in the Post-cold War Era